Magnetically Robust Non-Fermi Liquid Behavior in Heavy Fermion Systems with f²-Configuration: Competition between Crystalline-Electric-Field and Kondo-Yosida Singlets

الأصل · EN

We study a magnetic field effect on the Non-Fermi Liquid (NFL) which arises around the quantum critical point (QCP) due to the competition between the f²-crystalline-electric-field singlet and the Kondo-Yosida singlet states by using the numerical renormalization ground method. We show the characteristic temperature TF*, corresponding to a peak of a specific heat, is not affected by the magnetic field up to Hz* which is determined by the distance from the QCP or characteristic energy scales of each singlet states. As a result, in the vicinity of QCP, there are parameter regions where the NFL is robust against the magnetic field, at an observable temperature range T > TF*, up to Hz* which is far larger than TF* and less than min(Tₖ₂, Delta).